NUM; National Union of Motor Assembly and RubberWorkers of South Africa;
南非汽车装配与橡胶工人全国联盟；
2
The British brought them to Sri Lanka in the 19th century as tea and rubber plantation workers, and they remain concentrated in the "tea country" of south-central Sri Lanka.
Studies have found higher bladder cancer rates among people in various occupations, including hairdressers, textile workers, truck drivers and workers in the rubber, leather and chemical industries.